The Seven Islands Land Company records contain land ownership documentation, field work and exploration notes, business records, and wills and trusts that can be used to further track land the Pingree's legacy of land ownership. The majority of this collection is made up of records that were created before the establishment of Seven Islands, and would have been collected or inherited by them and used as reference for the Company's work, except for a few items which were created after Seven Islands was established. The materials cover land in both Maine and New Hampshire. Some of the items or their original wrappings (original from when they were organized and transferred by Seven Islands) have stickers with numbers on them. These numbers were used by Seven Islands for identification when the materials were packed up and moved from Seven Islands Land Company offices to the Essex Institute; the packing lists can be found in the control file.

Series I. Land Deeds and Titles contains land deeds and abstracts of titles of land owned, bought, sold, or managed by David Pingree, E. S. Coe, or their agents. Some of the deeds and titles have been arranged alphabetically, others have been arranged by location; the documents have been left in the original arrangement in which they were deposited (alphabetically or by location). Subseries A. Deeds and Abstracts of Titles contains land deeds and abstracts of titles of land owned, bought, sold, or managed. The first set of deeds and abstracts of titles have been arranged alphabetically and an index for these can be found in the box 1, folder 1. Within these alphabetized deeds and abstracts of titles, letters with larger amounts of materials have been further divided geographically. Before the abstracts of titles and memos start, there is a folder titled "Summary of abstracts of titles and memos" which contains a detailed description of what can be found within the abstracts of titles and memos. Subseries B. Deeds and Abstracts of Titles Indexed in 1953 contains an alphabetical list of copies of deeds and abstracts of titles that were indexed in 1953. These materials were not integrated into the other deeds and abstracts of titles because of their having been indexed; they are arranged in alphabetical order. It is unclear who indexed these records or why. Subseries C. Abstracts of Titles and Memos contains abstracts of titles and memos from land in Northern Maine, which was indexed by location. It is unclear who indexed these or when it was done.

Series II. Field Work and Exploration contains field and exploration notes taken by surveyors and agents, sketches, surveys, maps, correspondence, and related business papers. The exploration notes, surveys, and maps appear to have been completed by agents working for David Pingree and/or for E. S. Coe. Subseries A. Field and Exploration Notes contain field work and exploration notes in the form of bound volumes and loose papers. All of the volumes and notebooks were numbered by Seven Islands before their transfer to the museum; these numbers are not the same as the numbers listed in this finding aid, but do correspond to the numbers on the original packing lists (found in the control file before the start of the Pingree collection). Some of the notebooks are missing their contents or are missing from the series. Notebook numbers seven and thirty (original numbers) are missing their contents. Any missing notebooks were removed before they were transferred to the Museum from Seven Islands. There are some sketches and maps within this subseries that have notes and other correspondence attached to them, which is why they have been left in this subseries instead of being added to the next subseries.

Subseries B. Maps, Sketches and Surveys contains maps, sketches, and surveys of land tracts created by agents working for David Pingree and/or for E. S. Coe. The materials have been organized into these categories: Maine, New Hampshire, and miscellaneous or unknown. Subseries C. Other contains materials related to the field work and exploration of lands. This includes estimates, reports, specifications, advertisements for equipment needed, land appraisals, and other related papers. The contents of folder "Information and instructions for aerial mapping and volume measurement" were removed from a plastic binder; the items have been left in their original order.

Series III. Other Business Records contains financial records, correspondence, and other miscellaneous business records. Subseries A. Financial Records contains materials concerning taxes, land valuation for taxes, uncollected accounts, and payroll information. Subseries B. Correspondence contains correspondence and memoranda. Within this subseries is a wooden card file drawer that contains indexed letter references. It is not immediately clear to what correspondence this index is referring, as the correspondence in this collection is very limited. It is possible that the correspondence it refers to is filed within the land deeds and titles, or that the correspondence was not transferred to the museum. Subseries C. Other contains company charters, acts to incorporate, legislative information, committee reports, and some other miscellaneous items. Included within this series is a list of questions that were asked of Stephen Wheatland about his business practices, and what appear to be answers given. Also included within this subseries is a photograph of E. S. Coe.

Series IV. Wills and Trusts contains copies of wills of Pingree family members and their descendants. These wills and trusts help to explain the legacy of land ownership that has helped to form the land ownership under Seven Islands Land Company. Also included in this series are materials related to the trust under the will of Ann Maria Wheatland involving the Great Northern Paper Company.